How to Season a Cast Iron Skillet
Heating a thin coat of oil past its smoke point triggers polymerization, a chemical reaction that turns the liquid oil into a hard, plastic-like layer bonded directly to the iron. Stacking several very thin layers this way, rather than one thick one, builds a durable coating that's naturally slick and resists rust, which is why thin coats baked repeatedly beat one heavy coat every time.
- Prep
- 20 min
- Cook
- 120 min
- Total
- 150 min
- Servings
- 1
Ingredients
- 1 skillet cast iron skillet
- 2 teaspoons neutral high smoke-point oil (vegetable, canola, or flaxseed oil)
- 1 teaspoon mild dish soap
- 2 tablespoons coarse salt, for scrubbing stuck-on residue
- 4 sheets paper towels or a lint-free cloth
Nutrition per serving
- Calories
- 80
- Protein
- 0g
- Carbs
- 0g
- Fat
- 9g
Based on the recipe as written, one serving. Recalculates if you swap an ingredient above. An estimate only, exact values depend on the specific ingredients used.
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Instructions
- 1Wash the skillet with warm water and the dish soap, scrubbing with a stiff brush or non-metal pad to remove any rust, sticky residue, or factory coating. This is the one time soap on cast iron is fine, since there's no seasoning left to protect yet.
- 2If there's stubborn stuck-on food or patchy rust, scrub with the coarse salt and a damp cloth, or use a chainmail scrubber, then rewash and dry.
- 3Set the dry skillet on the stovetop over low heat for 2 to 3 minutes to fully evaporate any remaining moisture, including around the handle rivets and in the pores of the metal.
- 4Remove from the heat and let it cool slightly, then rub a thin layer of oil over the entire skillet, inside, outside, and handle, using a paper towel.
- 5Wipe the skillet down again with a clean, dry paper towel until it looks almost dry, with no visible puddles or streaks of oil.
- 6Place the skillet upside down on the middle rack of an oven preheated to 450-500°F (230-260°C), with a sheet of foil on the rack below to catch any drips.
- 7Bake for 1 hour, then turn off the oven and let the skillet cool completely inside before removing it.
- 8Repeat the thin oiling and baking cycle two to three more times to build a durable, dark, non-stick coating.
Tips & variations
- Flaxseed oil polymerizes into a noticeably harder, glassier coating than vegetable or canola oil, but it's pricier and usually needs more rounds to build up.
- Skip butter, olive oil, or other low smoke-point fats for seasoning; they burn and turn gummy or rancid instead of curing into a hard finish.
- New, bare, or freshly stripped cast iron benefits from 3 to 4 full seasoning rounds before regular cooking; an already-seasoned pan usually just needs a light wipe of oil baked once after a thorough wash.
- A self-clean oven cycle or a long soak in oven cleaner will strip a skillet back to bare gray metal, which is the fastest way to start over if seasoning has gone patchy or flaked.
Storage & reheating
Store a seasoned skillet fully dry, since any leftover moisture invites rust even on a well-seasoned surface. Rub in a very light film of oil before putting it away, and if stacking pans, slide a paper towel or cloth between them to absorb moisture and prevent scratching. If light surface rust does appear, scrub it off with salt and water, dry it on the stove, and redo one round of the oiling and baking cycle.
Tips from the Tulo kitchen
- A cold skillet feels slightly tacky right out of the oven even when seasoned correctly; that tackiness fades once it's completely cool, so judge the finish after it drops to room temperature.
- Cooking bacon or other fatty foods in a newly seasoned pan for the first several uses helps build up the coating faster than cooking lean, dry foods.
FAQ
What oil is best for seasoning cast iron?
Neutral oils with a high smoke point work best, including vegetable oil, canola oil, or grapeseed oil. Flaxseed oil produces the hardest finish but is more expensive and prone to flaking if applied too thickly.
Why is my cast iron sticky after seasoning?
Stickiness almost always means the oil layer was too thick before baking. The oil didn't fully polymerize and instead left a gummy residue; scrub it back with salt, redry, and redo the round with a much thinner wipe of oil.
How often should I re-season cast iron?
A well-maintained pan rarely needs a full re-season, just a light wipe of oil after washing. A full stovetop-to-oven re-season is worth doing whenever food starts sticking noticeably or rust spots appear.
Can I season cast iron on the stovetop instead of the oven?
Yes, though it heats less evenly. Wipe on a thin layer of oil, then heat the skillet over medium heat until it stops smoking and the surface darkens, repeating several times; the oven method just reaches a more even, consistent temperature across the whole pan.
